Incidence and characterization of esophagitis following esophageal foreign body removal in dogs: 60 cases (1999–2003)

Objective: To characterize the presence of esophagitis in dogs after esophagoscopy for diagnosis and treatment of esophageal foreign body and to relate the degree of esophageal injury to clinical signs and outcome. Design: Retrospective study. Animals, intervention, and measurements: Medical records of 60 dogs with esophageal foreign bodies diagnosed between January 1999 and December 2003 were reviewed. Information obtained from the medical records included age, breed, and sex; type and duration of clinical signs; physical examination, radiographic, and esophagoscopy findings; type and location of foreign body; surgical intervention; morbidity, and outcome. Animals were divided into 2 cohorts based upon the degree of esophageal injury detected during esophagoscopy: mild esophagitis or moderate‐to‐severe esophagitis. Data were then compared between the groups. Results: Dogs with moderate‐to‐severe esophagitis had a longer duration of clinical signs, were more likely to present for lethargy and regurgitation/vomiting, and had a longer time to recovery. This cohort had significantly greater morbidity including esophageal stricture, perforation, necrosis, and diverticulum formation, as well as aspiration pneumonia, pneumothorax, severe tracheal compression, and death. Dogs with mild esophagitis were more likely to present to the hospital for gagging. Conclusions: This study demonstrated a wide range of injury associated with esophageal foreign bodies. The degree of esophagitis appears to relate to the duration and severity of some of the clinical signs.     

Bearing capacity of composite columns reinforced by concrete filled steel tube

In this study, nine simplified short composite columns consisting of core CFST (concrete filled steel tube) of different diameters and outer reinforced concrete were constructed to study their compressive performance under axial or eccentric compression. The failure mode is characterized by the crush of the outer concrete. The bearing capacity increases at first and then decreases with further increase of the position coefficient. It can be concluded that position coefficient is an important structural parameter that has considerable influences on the ultimate bearing capacity of the composite columns. The outer concrete, steel tubes and longitudinal reinforcement are found to work in a cooperative manner under axial or eccentric compression when the position coefficient is about 0.5. An improved bearing capacity algorithm that takes the position coefficient into account has been proposed based on the experimental and simulation results and current technical specification in China. It has been proven to be precise and safe.     

川西北牦牛布鲁氏菌病血清流行病学调查

同时采用间接ELISA、虎红平板凝集试验和试管凝集试验三种血清学方法调查川西北牦牛布鲁氏菌病血清流行情况。对1070份采自川西北阿坝州8个草地县的牦牛血清样品经三种血清学方法检测,间接ELISA检测阳性率为25.4%（272/1070）,虎红平板凝集试验检测阳性率为12.7%（136/1070）,而试管凝集试验检测阳性率为9.1%（97/1070）。8个县均发现阳性布鲁氏菌病血清。与间接ELISA相比,虎红平板凝集试验的相对敏感性和特异性分别为50%和100%,而试管凝集试验的相对敏感性和特异性分别为35.7%和100%。布鲁氏菌病在川西北地区广泛存在,血清学方法是检测和监测布鲁氏菌病最常用和最简便的方法,其中间接ELISA方法最为敏感。     

蓝莓丛生芽增殖的诱导研究

利用两种优良成龄蓝莓的茎段腋芽为外植体,研究了基本培养基、植物生长调节剂对诱导蓝莓丛生芽增殖的影响,剪除丛生芽对诱导新一代丛生芽增殖的影响,同时进行了试管微芽继代增殖培养.结果表明:南高丛蓝莓丛生芽最佳诱导增殖培养基为WPM+ ZT 2.5 mg/L,试管微芽继代增殖最适培养基为WPM+ZT 0.3 mg/L;兔眼蓝莓丛生芽最佳诱导增殖培养基是WPM-A+ZT 2.5 mg/L,试管微芽继代增殖最佳培养基是WPM+ZT 2.0 mg/L.剪除丛生芽对诱导新一代丛生芽具有较显著促进作用.     

DF—80孵化机翻蛋自控设备的故障分析与改装

本文对DF——80孵化机翻蛋自控装置常出现的不翻蛋、只能单方向翻蛋等失控故障进行了分析。对原电路进行了重新设计与改装。改装后设备运行良好。     

小麦条锈菌夏孢子和芽管细胞核荧光染色技术

用荧光染料DAPI研究结果表明,小麦条锈菌夏孢子染核的最适浓度为5μg/mL,染色时间为3min;夏孢子芽管染核的适宜浓度为3μg/mL,染色时间为2～3min。本研究还发现DAPI对分属于5个亚门中的30种植物病原真菌的孢子(孢子囊)、芽管和菌丝同样具有较好的染核效果。     

井管外围填砾石对井管压力的研究

利用模型试验测量井管外围填砾石对井管的压力，初步分析了砾石对井管压力的大小、分布规律以及砾石的粒径、级配、围填高度、厚度对压力大小的影响。     

N、P、K元素对油松试管苗生长及生根诱导的影响

对油松试管苗根诱导适宜N、P、K浓度、及其形态配比筛选进行了研究。结果表明:1)培养基中NPK浓度及其形态与配比对油松无根试管苗生长及质量有着明显影响,从而影响着油松试管苗不定根的诱导;2)经筛选,油松试管苗生长培养N、P、K形态配比适宜组合是MS培养基N源总浓度保持不变情况下,NO3-/NH 4比值为4,P、K素浓度提高为MS培养基中P、K素浓度的2倍(简称改良MS培养基);3)油松无根试管苗生根培养,可先培养在改良MS培养基附加0.1 mg.L-1IBA和0.1 mg.L-1IAA,1.0 mg.L-1NAA.20 d左右,再转接在不添加生长调节剂的改良MS培养基上40 d左右,最后培养在只含0.55%琼脂和3%蔗糖的空白培养基。     

花粉管通道介导玉米总DNA导入小麦D1代的农艺性状研究

采用花粉管通道法介导玉米总DNA导入4个小麦品种(系)"9411"、"955159"、"96266"和鲁麦21中,并对转基因D1代的农艺性状进行了分析.研究发现,与对照相比,鲁麦21和"96266"的转基因D1代株高、穗长的差异达极显著水平;"9411"、"955159"、"96266"的转基因D1代的旗叶叶长和叶面积均达极显著水平;在"9411"的转基因D1代中,出现无芒变异的植株占20%左右;在"9411"的转基因D1代中,也发现了穗型与抗病性同时发生变异的植株.